Yep, it's the Kingdom version. Check out the rest of my thread, this is a known issue for a ton of early 2020's TFs.
I believe the explanation given was it was a new kind of material they didn't know yellowed so fast (even out of sunlight), but they say they don't use it anymore at least
I knew of the Earthrise Megatron yellowing issue but had no idea how widespread of an issue it was. Definitely worried about my Kingdom Grimmy now thst I've seen yours.
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Siller linings
Tigatron needs to be snow-white & mint green, the yellow just ruins the look imo
I do know it tends to be unpaintable nylon which is a bummer
I believe the explanation given was it was a new kind of material they didn't know yellowed so fast (even out of sunlight), but they say they don't use it anymore at least